/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.fd.hc2vpp.l3.write.ipv4.subinterface;

import io.fd.hc2vpp.common.translate.util.FutureJVppCustomizer;
import io.fd.hc2vpp.common.translate.util.NamingContext;
import io.fd.hc2vpp.l3.utils.ip.write.IpWriter;
import io.fd.hc2vpp.v3po.util.SubInterfaceUtils;
import io.fd.honeycomb.translate.spi.write.ListWriterCustomizer;
import io.fd.honeycomb.translate.write.WriteContext;
import io.fd.honeycomb.translate.write.WriteFailedException;
import io.fd.jvpp.core.future.FutureJVppCore;
import javax.annotation.Nonnull;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev190527.interfaces._interface.sub.interfaces.SubInterface;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev190527.interfaces._interface.sub.interfaces.SubInterfaceKey;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev190527.sub._interface.ip4.attributes.ipv4.Address;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev190527.sub._interface.ip4.attributes.ipv4.AddressKey;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev190527.sub._interface.ip4.attributes.ipv4.address.Subnet;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev190527.sub._interface.ip4.attributes.ipv4.address.subnet.Netmask;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev190527.sub._interface.ip4.attributes.ipv4.address.subnet.PrefixLength;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev180220.interfaces.Interface;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev180220.interfaces.InterfaceKey;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.DottedQuad;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Write customizer for sub-interface {@link Address}
 */
public class SubInterfaceIpv4AddressCustomizer extends FutureJVppCustomizer
        implements ListWriterCustomizer<Address, AddressKey>, IpWriter {

    private static final Logger LOG = LoggerFactory.getLogger(SubInterfaceIpv4AddressCustomizer.class);
    private final NamingContext interfaceContext;

    public SubInterfaceIpv4AddressCustomizer(@Nonnull final FutureJVppCore futureJVppCore,
                                             @Nonnull final NamingContext interfaceContext) {
        super(futureJVppCore);
        this.interfaceContext = interfaceContext;
    }

    @Override
    public void writeCurrentAttributes(InstanceIdentifier<Address> id, Address dataAfter, WriteContext writeContext)
            throws WriteFailedException {
        setAddress(true, id, dataAfter, writeContext);
    }

    @Override
    public void deleteCurrentAttributes(InstanceIdentifier<Address> id, Address dataBefore, WriteContext writeContext)
            throws WriteFailedException {
        setAddress(false, id, dataBefore, writeContext);
    }

    private void setAddress(boolean add, final InstanceIdentifier<Address> id, final Address address,
                            final WriteContext writeContext) throws WriteFailedException {

        final String interfaceName = id.firstKeyOf(Interface.class).getName();
        final String subInterfaceName = getSubInterfaceName(id);
        final int subInterfaceIndex = interfaceContext.getIndex(subInterfaceName, writeContext.getMappingContext());

        Subnet subnet = address.getSubnet();

        if (subnet instanceof PrefixLength) {
            setPrefixLengthSubnet(add, id, interfaceName, subInterfaceIndex, address, (PrefixLength) subnet);
        } else {
            setNetmaskSubnet(add, id, interfaceName, subInterfaceIndex, address, (Netmask) subnet);
        }
    }

    private String getSubInterfaceName(@Nonnull final InstanceIdentifier<Address> id) {
        final InterfaceKey parentInterfacekey = id.firstKeyOf(Interface.class);
        final SubInterfaceKey subInterfacekey = id.firstKeyOf(SubInterface.class);
        return SubInterfaceUtils
                .getSubInterfaceName(parentInterfacekey.getName(), subInterfacekey.getIdentifier().intValue());
    }

    private void setNetmaskSubnet(final boolean add, @Nonnull final InstanceIdentifier<Address> id,
                                  @Nonnull final String subInterfaceName, final int subInterfaceIndex,
                                  @Nonnull final Address address, @Nonnull final Netmask subnet)
            throws WriteFailedException {

        LOG.debug("Setting Subnet(subnet-mask) for sub-interface: {}(id={}). Subnet: {}, address: {}",
                subInterfaceName, subInterfaceIndex, subnet, address);

        final DottedQuad netmask = subnet.getNetmask();

        final byte subnetLength = getSubnetMaskLength(netmask.getValue());
        addDelAddress(getFutureJVpp(), add, id, subInterfaceIndex, address.getIp(), subnetLength);
    }

    private void setPrefixLengthSubnet(final boolean add, @Nonnull final InstanceIdentifier<Address> id,
                                       @Nonnull final String subInterfaceName, final int subInterfaceIndex,
                                       @Nonnull final Address address, @Nonnull final PrefixLength subnet)
            throws WriteFailedException {
        LOG.debug("Setting Subnet(prefix-length) for sub-interface: {}(id={}). Subnet: {}, address: {}",
                subInterfaceName, subInterfaceIndex, subnet, address);

        addDelAddress(getFutureJVpp(), add, id, subInterfaceIndex, address.getIp(),
                subnet.getPrefixLength().byteValue());

        LOG.debug("Subnet(prefix-length) set successfully for sub-interface: {}(id={}). Subnet: {}, address: {}",
                subInterfaceName, subInterfaceIndex, subnet, address);
    }
}
